|
| year | production | change |
| 1980 | 1656 | NA |
| 1981 | 1125 | -32.07 % |
| 1982 | 823 | -26.84 % |
| 1983 | 1064 | 29.28 % |
| 1984 | 1157 | 8.74 % |
| 1985 | 1023 | -11.58 % |
| 1986 | 1419 | 38.71 % |
| 1987 | 1585 | 11.70 % |
| 1988 | 1492 | -5.87 % |
| 1989 | 1783 | 19.50 % |
| 1990 | 1175 | -34.10 % |
| 1991 | 190 | -83.83 % |
| 1992 | 1058.1 | 456.89 % |
| 1993 | 1852.36 | 75.06 % |
| 1994 | 2025 | 9.32 % |
| 1995 | 2057.41 | 1.60 % |
| 1996 | 2061.65 | 0.21 % |
| 1997 | 2007.1 | -2.65 % |
| 1998 | 2085.34 | 3.90 % |
| 1999 | 1897.7 | -9.00 % |
| 2000 | 2078.5 | 9.53 % |
| 2001 | 1997.5 | -3.90 % |
| 2002 | 1894.16 | -5.17 % |
| 2003 | 2136 | 12.77 % |
| 2004 | 2375.7 | 11.22 % |
| 2005 | 2529.18 | 6.46 % |
| 2006 | 2535.34 | 0.24 % |
Source: United States Energy Information Administration
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